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United States Patent | 5,162,068 |
Yamamoto ,   et al. | November 10, 1992 |
Disclosed is a method for preventing the oxidation of a lead frame in a bonding system comprising the steps of introducing a first atmospheric gas toward a bonding portion of a lead frame along a surface of the lead frame and supplying a second atmospheric gas to shield the bonding portion from contact with ambient air simultaneously with the introduction of the first atmospheric gas.
Inventors: | Yamamoto; Masayuki (Fukuoka, JP); Hayashi; Kazuyuki (Fukuoka, JP) |
Assignee: | Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 769164 |
Filed: | September 30, 1991 |
Mar 23, 1988[JP] | 63-39111 |
Current U.S. Class: | 156/285; 29/840; 156/497; 219/56.22; 228/220 |
Intern'l Class: | B32B 031/14; B23K 031/02 |
Field of Search: | 156/285,382,381,497 228/220,219,42 219/56.22 29/831,840,854 250/492.1 34/23,34,148 |
4732313 | Mar., 1988 | Kobayashi et al. | 219/56. |
Foreign Patent Documents | |||
58-159739 | Oct., 1983 | JP. | |
62-178533 | Nov., 1987 | JP. |